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Abstract

Maps from 1904 and 1915 and air photographs from 1963, 1980, 1985, 1993 and 1996 provide a record of landslide incidence in a 92.1-km2 drainage basin, a headwater tributary of the Cho-shui River in Taiwan. Interpretation of landslide patterns from the early maps indicate that in 4 sub-basins structural geological factors control chronic landsliding regularly reactivated by intense rains. Within these 4 sub-basins, all later air photographs reveal a continuing high incidence of landslides. Logging activity, major road construction, and extreme typhoon and earthquake events produce short-term acceleration of landslide incidence